Types and superposed patterns of distributary channels in a shallow lacustrine delta plain
He Tingting1, Li Shengli1, Gao Xingjun2, Song Cen1, Zhou Xinmao2, He Dongxu3
1 China University of Geosciences(Beijing),Beijing.100083 2 Research Institute of Petroleum Exploration and Development,Beijing.100083 3 Shengli oil production plant of Shengli Oilfield Co.,Sinopec, Dongying.257000,Shandong
Abstract：Shallow lacustrine deltas are well-developed in many continental basins in China. Distributary channel is the main type of the sand body in a delta plain. Most of distributary channels are characterized by frequent diversion,multistage cross and superposition,which usually formed superposed distribution pattern of complex reservoirs. Based on the well-logging of distributary channel sand bodies of the shallow delta plain in Songliao Basin,this paper summarizes channel types and superposed patterns of the distributary channels in the shallow delta plain.Further,the constraint effect of these patterns on the correlation of sand bodies is analyzed. Study shows that channel types of the distributary channels can be classified into three foundational types,including an atypical braided channel type,an atypical meandering channel type and a transitional type. Small scale,shallow cutting and fast branching are the common features of these three channel types. In addition,there are five foundational superposed patterns of the distributary channels. And there are two foundational mud interbed distributions in distributary channels based on channel types and superposed patterns of the distributary channels,such as parallel distributed mud interbeds and low-angle lateral-accretion mud interbeds. Finally,in terms of channel types and superposed patterns,the changed position of certain channel types and the connection of sand bodies between boreholes can be determined,then constraint the reservoir correlation and connection analysis of the sand bodies.
He Tingting,Li Shengli,Gao Xingjun et al. Types and superposed patterns of distributary channels in a shallow lacustrine delta plain[J]. JOPC, 2014, 16(5): 597-604.
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